well im just driving normally and compared to how it shifted a few weeks ago, it feels different. it seems like it shifts right above 2k but if i gas it a little harder it will go up to 3-4k. i dunno its not a really big difference but something has changed. it has 80k miles on it. whats the difference between flushing and changing tranny fluid? how much does that usually cost and should i have it done at dealership?